dyolink/docs/specs/voice-treatment-entry/spec.md

# Voice treatment entry

**Status:** Draft — not started
**Area:** Treatment workspace (CLINIC orgs)
**Created:** 2026-08-20

Fill a `TreatmentDetail` — including its lab dispatch — by speaking, instead of by
tapping through the type dropdown, the FDI chart, the prosthesis wizard and the lab
picker.

---

## 1. Goal

A clinician on the Treatment tab taps a microphone, describes the treatment for the
already-selected patient in one utterance, and is shown a **review sheet** of what was
understood. Fields they tick are applied to the open detail chip. Nothing is written to
the form without confirmation.

### In scope

One recording produces **exactly one** `TreatmentDetail`, and may fill every field of it:

| Field | Source |
|---|---|
| `treatmentType` | catalog code, matched against locale labels |
| `teeth` | FDI codes, via tooth-intent resolver |
| `toothSelectionGroups` | connected (bridge) / single spans |
| `comment` | cleaned dictated notes |
| lab: `prosthesisTypeCode` per tooth | default type + per-tooth overrides |
| lab: `destinationOrganizationId` | matched against the clinic's linked labs |
| lab: `dueDate` | via due-date intent resolver |

### Out of scope (v1)

- Multiple detail chips from one recording.
- `attachmentIds` — files cannot be dictated.
- Editing an existing detail by voice ("no, make that 15"). Confirming a recording always
  creates a **new** detail (see §2).
- Creating the treatment or selecting the patient by voice. A patient is already
  selected; voice only fills the form.
- Lab-side (`LAB` org) usage. Clinic only.

---

## 2. User flow and UI integration

### The control: Add detail, split

The `Add detail` button gains a second segment holding the mic. The halves read as
siblings — both end in a new detail — but they are **independent actions**:

- **Add half — unchanged.** Same `onAddDetail`, same seeding, same `setEntryStep`. It
  gains a neighbour and nothing else. Its logic is not modified, wrapped or made
  conditional.
- **Mic half** — starts a recording. Nothing is created until confirm (below).

The `Add detail` `<Button>` in `TreatmentDetailsEditor` becomes a segmented control built
exactly like the **detail chip's trash affordance** in the same file
(`TreatmentDetailsEditor.tsx`, the chip `<div>` + label `<button>` + remove `<button>`):

- an `inline-flex items-stretch overflow-hidden rounded-[var(--radius-md)]` wrapper;
- two raw `<button>` children divided by `border-s`, each with its own `disabled`,
  `title`, `aria-label` and `focus-visible:ring-inset`;
- styled `primary` (`bg-primary text-white`) to preserve the button's current look;
- `w-full sm:w-auto` on the wrapper with the Add half `flex-1`, reproducing today's
  `fullWidth` + `sm:w-auto shrink-0` behaviour.

The shared `Button` component is **not** reusable for the halves: it hardcodes
`rounded-[var(--radius-md)]` on each instance and owns auto-pending state, both of which
fight a segmented control. This is precisely why the chip pattern uses raw `<button>`s,
and this control follows it.

**Side:** the mic is the second flex child with `border-s` — the **logical end**, exactly
like the trash. Visually right in `en`/`nl`, visually left in `fa`. No physical
left/right anywhere, per the repo's RTL rule.

```
en / nl (LTR)          fa (RTL)
[  Add detail │ 🎤 ]   [ 🎤 │  افزودن  ]
[ ترمیم 14,15 │ 🗑 ]   [ 🗑 │ ترمیم 14,15 ]
        ↑ same side as the chip's trash, in both directions
```

### Flow

```
[editable day]
        │
        ▼  tap 🎤        ← mic swaps to ■ (red); Add half disabled
   recording ─────────── inline bar below the header row:
        │                ● 0:12 / 2:00  ▁▃▇▅▂▆█▄▁   [لغو]
        │                auto-stops at the 2:00 cap
        ▼  tap ■
   processing ────────── ● transcribing…   ○ extracting     [cancel]
        │
        ▼
   review sheet
     ☑ Type        ترمیم
     ☑ Teeth       [mini FDI chart]  14 15
     ☑ Notes       حساسیت به سرما
     ☐ Lab         لابراتوار سینا      ⚠ similar name
        │
        ▼  [Apply n fields]
   detail created or filled → normal save flow
```

**No layout shift.** The segmented control never changes size; only the mic's icon and
colour change. The timer and level meter live in a full-width bar inserted between the
header row and the chip strip — the header is `sm:justify-between`, so growing the button
mid-recording would shove the row on every start and every stop.

**Duration is capped at 2 minutes** (`maxMs`, configurable, v1 default `120_000`). The
timer shows `elapsed / 2:00` and the recorder auto-stops at the cap. `maxMs: null` means
uncapped and remains supported, but is not the v1 default.

Two minutes is generous against the longest realistic utterance — a full prosthesis
dictation with type, several teeth, a bridge, prosthesis type, lab and due date — while
bounding worst-case spend. It also sits comfortably inside the vendor limits (§4): 2
minutes of `webm/opus` is well under 1 MB against a 25 MB ceiling, and transcribes in a
few seconds against a 60s processing timeout.

Cost per recording is therefore bounded at **$0.012** of ASR (2 min × $0.006) plus
~$0.0008 of extraction — about **1.3¢ worst case**, against ~0.3¢ for a typical 20s
utterance.

### What confirm does

The detail is created **on confirm**, never on tap. Tapping the mic starts a recording and
nothing else, so cancelling, a vendor failure, a rate-limit, or navigating away leaves the
chip strip untouched — there is no orphan state to clean up.

Confirm **always appends a new detail**. One unconditional rule, no dependence on
invisible state: append `newDetail()` seeded with `defaultTreatmentTypeForAppointment`,
make it active, `setEntryStep('treatment')`, then apply the ticked rows on top — so an
extracted type overrides the seed, and unticking the type row leaves the seeded default in
place.

This reuses `newDetail()` and the same state transitions, but it is a **separate code
path**. `onAddDetail` is not called and not changed.

`setEntryStep('treatment')` matters: `showChrome` is always on, so the control is visible
during the **Lab** wizard step too. Confirming there returns to the treatment step.

> Accepted consequences:
> - Tapping Add and then 🎤 leaves behind the blank chip that Add created. It carries the
>   usual trash affordance.
> - Dictating into an existing detail is not supported in v1 — voice always makes a new
>   one.

### Render policy

Three different reasons for "no", rendered differently:

| Reason | Condition | Render |
|---|---|---|
| **Technical** | no voice profile for the locale; no `MediaRecorder` | segment **absent** — the control is byte-for-byte today's plain Add button |
| **Commercial** | `Plan.features.voiceTreatmentEntry` false | segment **absent** — ⚠ *not enforced in v1*, see §8 |
| **Contextual** | `!canEdit \|\| disabled` — past day, read-only load, no `TAB_TREATMENT_EDIT` | both segments render and **disable together**, like the chip's trash (`disabled:opacity-40 disabled:cursor-not-allowed`) |

"This feature isn't yours" and "not right now" are different statements. Absence avoids a
permanently dead control; disabling avoids the button resizing as the day strip moves.

`TAB_TREATMENT_EDIT` is resolved via `common/membership-permissions.ts`, never by reading
`membership.permissions` directly.

### Component API

`TreatmentDetailsEditor` gains exactly **one** optional prop. All behaviour —
`MediaRecorder`, the API call, error state — lives in `lib/voice/useVoiceCapture.ts`
(hooks belong in `lib/` per `AGENTS.md`) and is owned by `TreatmentWorkspace`. The editor
stays presentational and renders both the segment and the recording bar with its own
classes, keeping the segmented styling beside the chip pattern it mirrors.

```ts
/** Omit when voice is unavailable — the Add button then renders unsplit. */
voice?: {
  phase: 'idle' | 'recording' | 'processing';
  elapsedMs: number;
  level: number;   // 0..1, for the meter
  maxMs: number | null;   // v1: 120_000 (2 min). null = uncapped, supported but not default
  onStart: () => void;
  onStop: () => void;
  onCancel: () => void;
};
```

`voice === undefined` **is** the absent state above — availability is expressed by
presence rather than a separate flag, so the two cannot disagree.

### Accessibility

- Mic segment carries both `title` and `aria-label`, like the chip's trash, and its label
  changes with `phase`.
- Announce **phase transitions** via a `role="status" aria-live="polite"` region — the
  same idiom as the existing autosave status line. Do not put `aria-live` on the ticking
  timer.
- Focus ring is `focus-visible:ring-inset` tinted primary when idle, red while recording.

---

## 3. Architecture

Two sequential stages, both server-side. The vendor API key never reaches the browser.

```
browser ──audio(base64)──► POST /treatments/voice-extract
                                    │
                          ┌─────────┴─────────┐
                          │ 1. AsrProvider    │  audio + locale hint → transcript
                          └─────────┬─────────┘
                          ┌─────────┴─────────┐
                          │ 2. ExtractionProv │  transcript + catalog + ctx → VoiceIntent
                          └─────────┬─────────┘
                          ┌─────────┴─────────┐
                          │ 3. resolvers      │  intents → FDI codes, ISO date
                          │    (pure, tested) │
                          └─────────┬─────────┘
                                    ▼
                          VoiceExtractionResult  (resolved values + the intents
                                                  that produced them, for display)
```

**Why intents and not final values:** the model never emits an FDI code and never does
calendar arithmetic. It emits what it *heard*; deterministic, unit-tested code decides
what that means. This is what makes the two highest-consequence mappings — quadrant
mirroring and Jalali conversion — testable instead of hopeful.

### Endpoint

`POST /treatments/voice-extract`

- Guards: `JwtAuthGuard` + `ClinicOrgGuard`.
- Service-level check of `TAB_TREATMENT_EDIT`. The plan flag is **not** checked in v1
  (§8).
- Per-user throttle via `@nestjs/throttler` (present in `package.json`, currently wired
  nowhere in `src/` — this is its first use, so the module must be registered in
  `app.module.ts`). Configurable; v1 default **6 requests / 60s per user**
  (`VOICE_THROTTLE_LIMIT`, `VOICE_THROTTLE_TTL`). A human cannot approach that — a
  recording plus processing takes ten seconds at minimum — so it is purely an abuse and
  runaway-loop guard, which is doing more work than usual given v1 is ungated and
  uncapped (open item 14).
- Body: base64 audio + declared format + `clientTodayIso` + IANA `timeZone` +
  `treatmentDetailId`/`clientId` for context.

`clientTodayIso` and `timeZone` come from the client per the existing house rule
(`AGENTS.md`): never derive the clinic's civil day from `Date#getDay()` on the UTC
server. Reuse `common/zoned-civil-time.ts`.

---

## 4. Provider registry

ASR and extraction are **separate swappable roles**. They will not come from the same
vendor for every locale.

```ts
interface AsrProvider {
  transcribe(audio: AudioInput, localeHint: string): Promise<{ text: string; usage: AsrUsage }>;
}

interface ExtractionProvider {
  extract(transcript: string, catalog: CatalogPrompt, ctx: ExtractionContext): Promise<VoiceIntent>;
}
```

Resolved through a registry keyed by locale.

At launch **all three locales use the same profile** — OpenRouter with
`openai/whisper-1` for ASR. The per-locale indirection is kept anyway, because the
locale is the axis along which this is most likely to diverge: Persian ASR is the
weakest link (§11), and swapping only `fa` to a Persian-specialist vendor must not be a
code change.

```
VOICE_PROFILE_FA = openrouter:openai/whisper-1 | openrouter:<llm-model>
VOICE_PROFILE_EN = openrouter:openai/whisper-1 | openrouter:<llm-model>
VOICE_PROFILE_NL = openrouter:openai/whisper-1 | openrouter:<llm-model>
```

The `language` hint is the profile's locale as ISO-639-1 — `fa`, `en`, `nl` — not a
constant.

Reachability is a property of **where you deploy**, not of the code. The same image
serves an Iran-hosted instance with a domestic `fa` profile and a Europe-hosted instance
with an OpenRouter profile; only config differs. A locale with no configured profile has
no microphone button at all (§2).

> The frontend must learn which locales are enabled **from the API**, not from a
> `NEXT_PUBLIC_*` var — those are baked in at build time, so an env-var approach would
> make enabling a locale require rebuilding and repushing the frontend image.

### v1 provider: OpenRouter

Both roles, one API key.

**ASR** — `POST https://openrouter.ai/api/v1/audio/transcriptions`

```json
{
  "model": "openai/whisper-1",
  "input_audio": { "data": "<base64>", "format": "webm" },
  "language": "fa"
}
```

- Accepted formats: WAV, MP3, FLAC, M4A, OGG, **WebM**, **AAC**.
  Chrome/Android `webm/opus` and Safari/iPad `mp4/aac` both go through unmodified —
  **no transcode dependency is required**.
- Limits: 25 MB; 60s upstream *processing* timeout. The 2-minute recording cap (§2) sits
  comfortably inside both.
- Response: `{ text, usage: { seconds, total_tokens, cost } }`.
- Price: `openai/whisper-1` is **$0.006/minute, billed to the nearest second** → $0.002 for
  a typical 20s utterance, **$0.012 at the 2-minute cap**. OpenRouter forwards this model
  directly to OpenAI.

**Extraction** — OpenRouter chat completions with a JSON schema constraining the output
to `VoiceIntent`. Model id is config (`VOICE_LLM_MODEL`).

**Chosen: `google/gemini-3.7-flash`.**

Cost is deliberately *not* the selection axis. The call is ~1,250 input tokens (system
prompt + catalog labels + JSON schema + linked labs + transcript) and ~200 output, so the
whole candidate field spans about one cent per recording:

| Model | in / out per M tokens | ≈ per call |
|---|---|---|
| `google/gemini-3.7-flash` | $0.375 / $1.875 | $0.0008 |
| `qwen/qwen3.8-27b` | $0.45 / $3.20 | $0.0012 |
| `qwen/qwen3.8-max` | $2 / $6 | $0.0037 |
| `openai/gpt-5.6-terra` | $2 / $12 | $0.0049 |
| `anthropic/claude-opus-5` | $5 / $25 | $0.0113 |

Select for Persian comprehension and reliable constrained JSON instead. Gemini Flash wins
on the reasoning that this task is **not** reasoning-heavy — read a short sentence, pick
codes from a supplied closed list, emit small JSON — and it is simultaneously the cheapest
and lowest-latency candidate, which matters on a pipeline already at 3–10s.

**Escalation path if Persian comprehension proves weak** on real transcripts (item 1):
`qwen/qwen3.8-max` (leads current multilingual rankings, ~4.6× the cost) and then
`anthropic/claude-opus-5` as the accuracy ceiling. Both are a config change —
`VOICE_LLM_MODEL` — not a code change. Worth knowing when judging that ranking evidence:
it is marked provisional and was measured on the previous Qwen generation.

---

## 5. Extraction contract

The model returns intents only. Illustrative shape:

```ts
type VoiceIntent = {
  treatmentType: string | null;          // catalog code, from the supplied closed list
  teeth: ToothIntent[];
  connectedSpans: { from: ToothIntent; to: ToothIntent }[];
  comment: string | null;
  prosthesis: {
    defaultType: string | null;          // catalog code
    overrides: { tooth: ToothIntent; type: string }[];
  } | null;
  labId: string | null;                  // must be one of the supplied linked-lab ids
  labMatchExact: boolean;
  due: DueIntent | null;
};

type ToothIntent =
  | { kind: 'explicit'; fdi: string; spoken: string }
  | { kind: 'positional'; arch: 'upper' | 'lower';
      side: 'patient_right' | 'patient_left'; position: number; spoken: string };

type DueIntent =
  | { kind: 'weekday'; weekday: string; which: 'this' | 'next' }
  | { kind: 'offset'; unit: 'day' | 'week' | 'month'; amount: number }
  | { kind: 'jalali'; jy: number; jm: number; jd: number }
  | { kind: 'gregorian'; y: number; m: number; d: number };
```

Every code-valued field is constrained to a **closed list supplied in the prompt**:

- Treatment types and prosthesis types come from `CatalogLabelService` in the actor's
  locale, so the model sees "پروتز" and "زیرکونیا مونولیتیک" as the spoken forms of
  `prosthesis` and `monolithic_zirconia` rather than being asked to translate. Catalog
  entities store a stable `code` and no label — never hardcode a label.
- Lab candidates are the clinic's linked labs only (`OrganizationLink`), passed as
  `{ id, name }`. The model may return one of those ids or `null`, nothing else.

Every unresolved or rejected item is reported, never silently dropped.

---

## 6. Resolvers

Both live in `backend/src/`, pure and Jest-covered. The frontend has **no test runner**
(no jest/vitest, zero spec files) — putting them there would forfeit the testability
that justified this whole design.

### `resolveToothIntent()`

- Owns the patient-right convention in exactly one place: `upper + patient_right` →
  quadrant 1, `upper + patient_left` → 2, `lower + patient_left` → 3,
  `lower + patient_right` → 4. This is the mirroring bug, and it becomes a unit test.
- Rejects out-of-range positions rather than clamping. Position 9 is unresolved, never 8.
- Permanent dentition only — FDI 11–18/21–28/31–38/41–48, matching
  `FDI_UPPER_LEFT_TO_RIGHT` / `FDI_LOWER_LEFT_TO_RIGHT`. Deciduous references
  ("دندان شیری") must resolve to **unresolved**, never snap to a permanent tooth.
- **Locale-neutral by construction.** `ToothIntent` carries `arch`/`side`/`position`, not
  words, so the resolver needs no per-locale branches. The locale-specific part is the
  *prompt*: each enabled locale needs its own spoken tooth vocabulary (`شش بالا راست`,
  `upper right six`, `rechtsboven zes`).
- **English carries a numbering hazard the other locales do not.** A clinician trained
  under Universal numbering says "tooth number 14" and means a different tooth than FDI
  14. `nl` is safe — the Netherlands uses FDI — but `en` is not. The `en` prompt must
  therefore not accept a bare two-digit number as `explicitFdi` without the speaker
  having made the notation explicit; ambiguous English numerals resolve to
  **unresolved**. See §11.

### `resolveDueDate()`

- Takes `clientTodayIso` + IANA `timeZone`; reuses `common/zoned-civil-time.ts`.
- Week starts **Saturday** (Iranian week) — one place, tested.
- Jalali conversion is arithmetic, not inference: port `jalaliToGregorian` and
  `toLatinDigits` from `frontend/src/lib/i18n/persianCalendar.ts` into
  `backend/src/common/jalali.ts` with a spec. It is dependency-free integer math
  (~60 relevant lines) and the calendar does not change, so the duplication is stable.

### Group / prosthesis rules

- Connected spans validate through the shipped helpers — `areArchNeighbors`, `sameArch`,
  `teethBetweenInclusive`. **Never a 1-tooth connected group.** Anything invalid degrades
  to singles and is flagged on the review sheet.
- Prosthesis: expand `defaultType` across all teeth, then apply per-tooth overrides.
- **All-or-nothing.** `assertCompleteToothProsthesisMap` requires every tooth on a
  `prosthesis` detail to carry a `prosthesisTypeCode` or the send throws
  `TREATMENT_TOOTH_PROSTHESIS_INCOMPLETE`. So if even one tooth ends untyped, the
  prosthesis row is marked incomplete and stays unticked — the unshippable state surfaces
  at review, where it is cheap, not at dispatch minutes later on another screen.
- **Apply order is teeth → groups → prosthesis**, so `pruneToothProsthesisForGroups`
  behaves.

---

## 7. Review sheet

**Presentation:** a **modal** on desktop; a **full-screen overlay** on mobile.

> ⚠ On mobile this must be an overlay rendered in place — **not** a Next.js route. A real
> navigation unmounts `TreatmentWorkspace` and destroys the in-progress draft. This is the
> same constraint the realtime soft-refresh already lives under: never remount the
> treatment form, never clear a draft.

- Renders the transcript, then one row per extracted field in the app's own vocabulary:
  translated catalog labels, and a mini FDI chart for the teeth rather than a list of
  numbers.
- Each row has a checkbox. Ticked rows apply; nothing else is touched. Confirm is also
  what creates the new detail — see §2.
- Rows default to ticked **except**:
  - the lab row when `labMatchExact` is false — shipping to a lab always requires a
    deliberate tick;
  - any row carrying an unresolved item or an incomplete prosthesis map.
- Unresolved items are shown with what was heard ("دندان شیری — بازشناسی نشد"), so the
  clinician can see what the system did not understand.
- RTL-safe: logical `text-start` / `text-end` only, never `text-left`/`text-right`.
  Dates via `lib/i18n/format.ts`.

---

## 8. Gating and configuration

Gate = `TAB_TREATMENT_EDIT` ∧ `canEditTreatmentForDay` ∧ configured locale profile ∧
`Plan.features.voiceTreatmentEntry`. How each failing condition *renders* is in §2.

`Plan.features` is a `Json` column that already exists on the `Plan` model and is seeded
as `{}` for all five plans — and is **read nowhere in `backend/src/`**. Voice is its first
consumer, so:

- No migration is needed.
- The read should go through a small generic helper, since this establishes the pattern
  for every future flag.
- Voice is metered vendor spend, which is why the gate is commercial (plan) rather than a
  new `TAB_*` permission — a clinician who can already edit the form gains no capability
  from voice, only speed.

The per-user throttle is a separate, non-commercial abuse control.

### v1 ships ungated

**The plan flag is designed but not enforced in v1** — voice is open to every clinic user
who can edit treatments, in every configured locale. `Plan.features.voiceTreatmentEntry`
and the availability API stay documented here as the intended gate, deferred rather than
dropped, so turning them on later is additive.

Consequence to accept deliberately: with no plan gate and no duration cap (§2), the
per-user throttle is the **only** control on metered vendor spend. See open item 14.

---

## 9. Errors

Per the three-layer contract: a code in `common/errors/error-codes.ts`, the throw site,
and an `errors.X` key in **all three** of `frontend/messages/{en,fa,nl}.json`. Never a raw
English Nest exception for a user-facing failure.

| Code | When |
|---|---|
| `VOICE_MIC_DENIED` | browser permission refused — **client-side only**: needs the `errors.X` key in all three message files, but no `ErrorCode` entry and no throw site |
| `VOICE_CLIP_TOO_LONG` | over `maxMs` (server-side re-check), or over vendor limits |
| `VOICE_UNSUPPORTED_FORMAT` | recorder produced a container the profile rejects |
| `VOICE_ASR_FAILED` | transcription stage failed |
| `VOICE_EXTRACT_FAILED` | transcript obtained, structuring failed |
| `VOICE_NOTHING_RECOGNIZED` | empty or unusable transcript |
| `VOICE_NOT_AVAILABLE` | no profile for locale (v1); plan flag off, once enforced |
| `VOICE_RATE_LIMITED` | throttle |

**Transcript salvage:** when ASR succeeded and only extraction failed, the response still
carries the transcript and the failure dialog offers *"افزودن به یادداشت"*. That action
**creates a new detail with only `comment` set to the transcript** — everything else left
at `newDetail()` defaults. The words were captured and paid for; only the structure was
lost.

This keeps the feature's one invariant intact: **voice never writes into an existing
detail.** Dictating into an already-filled detail is a separate, later feature with its
own voice-to-text control scoped to that field (§1, out of scope).

It also does not bypass the confirmation rule — the dialog shows the transcript, and the
dentist taps to accept it. That review matters, because a raw transcript carries ASR
errors and may contain the patient's spoken name, and `comment` is persisted (§10).

---

## 10. Data handling

- Audio is held **in memory for the request only**. Never written to disk, never a Prisma
  row. Note this is deliberately unlike treatment attachments, which do persist to
  `backend/uploads/treatments`.
- The transcript goes to the browser for the review sheet and dies with it.
- The `comment` field persists a cleaned version of what was said — that is legitimate
  clinical record-keeping and is the only durable trace.
- Telemetry is **structured and patient-free**: clip duration, which fields resolved,
  unresolved count, vendor latency, `usage.cost`, outcome (applied / discarded / failed),
  locale. Never the transcript, never audio, never a patient identifier.
  The **destination is an open question** — this repo has no metrics infrastructure yet
  (open item 9). Emit it as structured log lines in the interim so the fields exist and
  can be routed later without changing call sites.

**Cancelling aborts the in-flight vendor call** via `AbortController`, rather than letting
it settle and discarding the result. Note this reduces spend but does not eliminate it:
work already performed upstream may still be billed.

Recordings are clinical descriptions of identifiable patients leaving the server for a
third party. Confirm the provider's retention and training policy in writing before
enabling this for real clinics.

---

## 11. Open items

1. **Persian ASR accuracy on tooth numbers is unmeasured, and it decides the feature.**
   Everything downstream assumes a usable transcript; no design choice above compensates
   for a bad one. Run this before writing feature code.

   *Why tooth numbers specifically, not general accuracy:* a transcript can score well on
   WER and still be useless here, because the errors land on the digits.
   `چهار` (4) / `چهارده` (14) / `چهل` (40) differ by one syllable. FDI spoken as
   `یک چهار` may return as `۱۴`, `14`, or `یک چهار`. Persian and Latin digit scripts mix
   within one transcript. Jargon is loanwords (`زیرکونیا`, `پرسلن فیوزد تو متال`,
   `اینله`/`آنله`) and clinicians code-switch into English mid-sentence. Suction and
   handpiece run in the background.

   *Protocol:* ~25 utterances from a dentist reading a script covering explicit FDI,
   quadrant-relative phrasing, bridges, prosthesis types, due dates and notes — recorded
   on the real device, ideally once quiet and once with the operatory running. POST each
   to `/api/v1/audio/transcriptions` with `language: "fa"`. Score **per-tooth-reference
   accuracy** (of every tooth spoken, how many survive recoverably?) and jargon
   recognition separately. Notes accuracy barely matters. ~6 minutes of audio ≈ **$0.04**.

   *Decision it drives:* if tooth accuracy holds, build. If not, the fix is not prompt
   tuning — it is pointing the `fa` ASR slot at a Persian-specialist vendor while `en`/`nl`
   keep `whisper-1`. That is a config change precisely because of decision 23.

   *Unverified lead for that fallback:* recent Persian-ASR benchmark work reports
   Qwen3-Omni as the strongest open Persian ASR. Not confirmed as available on
   OpenRouter's transcription endpoint — check before relying on it.

   *Byproduct:* the recordings become the fixture corpus for item 2.
2. ~~**`VOICE_LLM_MODEL`**~~ — **resolved:** `google/gemini-3.7-flash` (§4). Still worth
   validating on real whisper output during item 1, since clean transcripts flatter every
   model; the escalation path if Persian comprehension disappoints is documented in §4 and
   is a config change.
3. ~~**Production reachability**~~ — **resolved:** confirmed reachable from the Iranian
   production host. The per-locale registry is retained regardless (decision 23), so the
   `fa` profile can still be repointed at a domestic vendor if item 1 goes badly.
4. ~~**Provider retention/training policy**~~ — **resolved:** restricted via OpenRouter's
   account-level privacy/data-policy settings. Note this is an *account* setting, not a
   per-request one: re-verify it if the API key or the OpenRouter account changes, and
   remember `whisper-1` is forwarded to OpenAI, so the effective policy is OpenRouter's
   plus that provider's.
5. **English tooth numbering is unresolved as a product question.** Enabling `en` means
   deciding what "tooth number 14" means when the speaker's notation is unknown —
   Universal or FDI. The spec's current answer is to refuse ambiguous bare numerals in
   `en`, which is safe but will feel broken to a US-trained clinician. Options are: refuse
   (current), an org-level notation preference, or restricting `en` to quadrant-relative
   phrasing. Decide before `en` ships to a real clinic; `fa` and `nl` are unaffected.
6. **`nl` and `en` have no spike data.** The Persian spike (item 1) should be repeated per
   locale before that locale's mic is enabled for real users — same protocol, same
   scoring, different speaker.

7. ~~**Transcript salvage has no target**~~ — **resolved:** salvage creates a **new
   detail** with only `comment` set to the transcript (§9). Preserves the invariant that
   voice never writes into an existing detail; dictating into a filled detail becomes a
   separate later feature with its own field-scoped control.
8. ~~**Throttle limits**~~ — **resolved:** configurable, v1 default **6 requests / 60s per
   user** (§3). Unreachable by a human; a pure abuse guard.
9. **Telemetry has no sink.** §10 defines exactly what to record but not where it goes —
   this repo has no metrics or analytics infrastructure yet. Deliberately deferred until
   it does. Interim: structured log lines, so the fields exist and can be routed later
   without touching call sites.
10. ~~**Review sheet modality**~~ — **resolved:** modal on desktop, full-screen **overlay**
    on mobile (§7). Not a route — navigating would unmount `TreatmentWorkspace` and destroy
    the draft.
11. ~~**Cancel and in-flight requests**~~ — **resolved:** abort via `AbortController` to
    limit spend (§10). Upstream work already performed may still be billed.
12. ~~**Recording duration cap**~~ — **resolved:** **2 minutes**, configurable via `maxMs`
    (§2). Still worth timing a realistic worst-case prosthesis dictation during item 1 to
    confirm 2 minutes is comfortable rather than tight.
13. ~~**Availability API**~~ — **resolved for v1:** voice ships **open to everyone** with a
    configured locale profile. No plan check, no availability endpoint. The `Plan.features`
    design in §8 is deferred, not dropped.

### New

14. **Cost exposure is bounded but ungated in v1.** With the 2-minute cap (12) and the
    6/60s throttle (8), worst case is 12 audio-minutes per user-minute ≈ **$0.072/min**, or
    ~$4.30 per hour of sustained abuse by one user — bounded, not free. Normal use is far
    below this: a clinician doing 60 recordings a day at ~20s each costs about **$0.18/day**.

    What remains open is that there is **no per-organization limit at all**, because v1
    ships ungated (13). Worth deciding what to watch and at what number to react.
    Mitigations, already designed and each a config or flag change: enforce the
    `Plan.features` gate, lower `maxMs` or the throttle, or add an org-level monthly minute
    budget.

---

## 12. Verification

- `cd backend && npm test` — new suites for `resolveToothIntent` (quadrant mapping in all
  four quadrants, out-of-range rejection, deciduous → unresolved), `resolveDueDate`
  (Saturday week start, "this" vs "next" weekday, Jalali leap year, month-end), the
  Jalali port, prosthesis expansion + completeness, and connected-span validation.
- `cd backend && npm run build` — cross-cutting backend gate.
- `cd frontend && npx tsc --noEmit` — frontend gate.
- Manual: fa locale, editable day, prosthesis detail with a bridge, dispatch to a linked
  lab. Then specifically:
  - **past day** → both segments disabled, control still split (not absent);
  - **locale with no profile** → control renders unsplit, identical to today;
  - **fa vs en** → mic sits at the logical end in both, on the same side as the chip's
    trash;
  - **cancel mid-recording** → chip strip unchanged, no orphan detail;
  - **confirm** → always appends a new chip, whatever the active detail contains;
  - **Add half** → behaves exactly as it did before this change;
  - **tap 🎤 during the Lab wizard step** → confirm returns to the treatment step;
  - no layout shift in the header row on record start, stop, or the 2:00 auto-stop;
  - **hold past 2:00** → auto-stops and proceeds to processing, not an error;
  - **cancel during processing** → the vendor request is actually aborted;
  - **review sheet on mobile** → full-screen overlay; closing it leaves the draft intact.

---

## 13. Decision log

Settled in a grilling session on 2026-08-20.

| # | Question | Decision |
|---|---|---|
| 1 | Scope | Everything including lab dispatch |
| 2 | AI supply chain | Domestic provider originally; OpenRouter for v1, registry keeps both open |
| 3 | Apply model | Review sheet, then apply |
| 4 | Speech → FDI | LLM emits intent, code resolves |
| 5 | Cardinality | One detail per recording |
| 6 | Lab destination | Closed list of linked labs, explicit confirm, unticked when inexact |
| 7 | Due date | Intent + deterministic resolver |
| 8 | Resolver location | Backend, Jalali math ported |
| 9 | Prosthesis | Default type + overrides, all-or-nothing |
| 10 | Retention | Discard audio and transcript, non-PHI telemetry only |
| 11 | Capture | Tap to start/stop, hard cap (see 27) |
| 12 | Failure UX | Stage-aware codes, transcript salvage |
| 13 | Locales | Provider registry per locale; all three locales enabled |
| 14 | Reachability | Registry now, slots filled per deployment |
| 23 | ASR model | `openai/whisper-1` for **every** locale; registry kept so `fa` can diverge |
| 24 | Extraction model | **`google/gemini-3.7-flash`**; escalation path documented in §4 |
| 25 | Salvage target | Creates a new detail with only `comment` set — voice never writes into an existing detail |
| 26 | Throttle | Configurable; v1 default 6 requests / 60s per user |
| 27 | Duration cap | **2 minutes**, configurable via `maxMs` |
| 28 | Review sheet | Modal on desktop, full-screen overlay (not a route) on mobile |
| 29 | Cancel | Aborts the in-flight vendor call |
| 30 | v1 gating | Open to everyone; `Plan.features` gate deferred, not dropped |
| 15 | Gating | `Plan.features` flag — its first consumer |

UI placement settled in a second grilling session on 2026-08-20.

| # | Question | Decision |
|---|---|---|
| 16 | Mic action | Independent record action; the Add half's logic is untouched |
| 17 | Record UI | Mic segment toggles ▶/■; inline bar below the header row |
| 18 | Unavailable | Absent for technical + commercial; disabled for contextual |
| 19 | Component API | One optional `voice` object prop; `undefined` means absent |
| 20 | Side | Logical end (`border-s`), exactly like the chip's trash |
| 21 | Creation | On confirm, never on tap |
| 22 | Creation rule | Confirm **always** appends a new detail — no blank-reuse guard |